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Linux/drivers/leds/leds-da9052.c

  1 /*
  2  * LED Driver for Dialog DA9052 PMICs.
  3  *
  4  * Copyright(c) 2012 Dialog Semiconductor Ltd.
  5  *
  6  * Author: David Dajun Chen <dchen@diasemi.com>
  7  *
  8  *  This program is free software; you can redistribute  it and/or modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  *
 13  */
 14 
 15 #include <linux/module.h>
 16 #include <linux/kernel.h>
 17 #include <linux/platform_device.h>
 18 #include <linux/leds.h>
 19 #include <linux/slab.h>
 20 
 21 #include <linux/mfd/da9052/reg.h>
 22 #include <linux/mfd/da9052/da9052.h>
 23 #include <linux/mfd/da9052/pdata.h>
 24 
 25 #define DA9052_OPENDRAIN_OUTPUT 2
 26 #define DA9052_SET_HIGH_LVL_OUTPUT      (1 << 3)
 27 #define DA9052_MASK_UPPER_NIBBLE        0xF0
 28 #define DA9052_MASK_LOWER_NIBBLE        0x0F
 29 #define DA9052_NIBBLE_SHIFT             4
 30 #define DA9052_MAX_BRIGHTNESS           0x5f
 31 
 32 struct da9052_led {
 33         struct led_classdev cdev;
 34         struct da9052 *da9052;
 35         unsigned char led_index;
 36         unsigned char id;
 37 };
 38 
 39 static unsigned char led_reg[] = {
 40         DA9052_LED_CONT_4_REG,
 41         DA9052_LED_CONT_5_REG,
 42 };
 43 
 44 static int da9052_set_led_brightness(struct da9052_led *led,
 45                                      enum led_brightness brightness)
 46 {
 47         u8 val;
 48         int error;
 49 
 50         val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
 51 
 52         error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
 53         if (error < 0)
 54                 dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
 55                         error);
 56         return error;
 57 }
 58 
 59 static int da9052_led_set(struct led_classdev *led_cdev,
 60                            enum led_brightness value)
 61 {
 62         struct da9052_led *led =
 63                         container_of(led_cdev, struct da9052_led, cdev);
 64 
 65         return da9052_set_led_brightness(led, value);
 66 }
 67 
 68 static int da9052_configure_leds(struct da9052 *da9052)
 69 {
 70         int error;
 71         unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
 72                                        | DA9052_SET_HIGH_LVL_OUTPUT;
 73 
 74         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
 75                                   DA9052_MASK_LOWER_NIBBLE,
 76                                   register_value);
 77 
 78         if (error < 0) {
 79                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
 80                         error);
 81                 return error;
 82         }
 83 
 84         error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
 85                                   DA9052_MASK_UPPER_NIBBLE,
 86                                   register_value << DA9052_NIBBLE_SHIFT);
 87         if (error < 0)
 88                 dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
 89                         error);
 90 
 91         return error;
 92 }
 93 
 94 static int da9052_led_probe(struct platform_device *pdev)
 95 {
 96         struct da9052_pdata *pdata;
 97         struct da9052 *da9052;
 98         struct led_platform_data *pled;
 99         struct da9052_led *led = NULL;
100         int error = -ENODEV;
101         int i;
102 
103         da9052 = dev_get_drvdata(pdev->dev.parent);
104         pdata = dev_get_platdata(da9052->dev);
105         if (pdata == NULL) {
106                 dev_err(&pdev->dev, "No platform data\n");
107                 goto err;
108         }
109 
110         pled = pdata->pled;
111         if (pled == NULL) {
112                 dev_err(&pdev->dev, "No platform data for LED\n");
113                 goto err;
114         }
115 
116         led = devm_kzalloc(&pdev->dev,
117                            sizeof(struct da9052_led) * pled->num_leds,
118                            GFP_KERNEL);
119         if (!led) {
120                 error = -ENOMEM;
121                 goto err;
122         }
123 
124         for (i = 0; i < pled->num_leds; i++) {
125                 led[i].cdev.name = pled->leds[i].name;
126                 led[i].cdev.brightness_set_blocking = da9052_led_set;
127                 led[i].cdev.brightness = LED_OFF;
128                 led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
129                 led[i].led_index = pled->leds[i].flags;
130                 led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
131 
132                 error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
133                 if (error) {
134                         dev_err(&pdev->dev, "Failed to register led %d\n",
135                                 led[i].led_index);
136                         goto err_register;
137                 }
138 
139                 error = da9052_set_led_brightness(&led[i],
140                                                   led[i].cdev.brightness);
141                 if (error) {
142                         dev_err(&pdev->dev, "Unable to init led %d\n",
143                                 led[i].led_index);
144                         continue;
145                 }
146         }
147         error = da9052_configure_leds(led->da9052);
148         if (error) {
149                 dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
150                 goto err_register;
151         }
152 
153         platform_set_drvdata(pdev, led);
154 
155         return 0;
156 
157 err_register:
158         for (i = i - 1; i >= 0; i--)
159                 led_classdev_unregister(&led[i].cdev);
160 err:
161         return error;
162 }
163 
164 static int da9052_led_remove(struct platform_device *pdev)
165 {
166         struct da9052_led *led = platform_get_drvdata(pdev);
167         struct da9052_pdata *pdata;
168         struct da9052 *da9052;
169         struct led_platform_data *pled;
170         int i;
171 
172         da9052 = dev_get_drvdata(pdev->dev.parent);
173         pdata = dev_get_platdata(da9052->dev);
174         pled = pdata->pled;
175 
176         for (i = 0; i < pled->num_leds; i++) {
177                 da9052_set_led_brightness(&led[i], LED_OFF);
178                 led_classdev_unregister(&led[i].cdev);
179         }
180 
181         return 0;
182 }
183 
184 static struct platform_driver da9052_led_driver = {
185         .driver         = {
186                 .name   = "da9052-leds",
187         },
188         .probe          = da9052_led_probe,
189         .remove         = da9052_led_remove,
190 };
191 
192 module_platform_driver(da9052_led_driver);
193 
194 MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
195 MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
196 MODULE_LICENSE("GPL");
197 

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